<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8">
		<title></title>
		<style>
			p:first-letter{
				color:red;
				font-size:30px;
			}
			p:first-line{
				background:pink;
			}
			p:before{
				content:"嘿嘿";
			}
			p:after{
				content:"哈哈";
			}
		</style>
	</head>
	<body>
		<p>
			hello world<br>
			welcome to css
		</p>
	</body>
</html>
